function [ status ] = mx_eyelink_node_send_message_ex(exectime, node, msg )
%MX_EYELINK_NODE_SEND_MESSAGE_EX Send a data file message to any or all trackers
% with time offset.
%
% Parameters:
% exectime 	time offset. If the offset is 0, this function is the same as 
% 		eyelink_node_send_message()
% node 		Node address
% msg 		Message to be sent
% Returns:
% OK_RESULT or LINK_TERMINATED_RESULT.
%
% OK_RESULT 0;
% LINK_TERMINATED_RESULT -100;
%----------------------------------------------------------------------------
% Copyright Eduardo Aponte 2013
% aponteeduardo@gmail.com